diff options
Diffstat (limited to 'tensorflow/python/feature_column/feature_column.py')
| -rw-r--r-- | tensorflow/python/feature_column/feature_column.py | 169 |
1 files changed, 9 insertions, 160 deletions
diff --git a/tensorflow/python/feature_column/feature_column.py b/tensorflow/python/feature_column/feature_column.py index 40219e4b34..d091d2fe0a 100644 --- a/tensorflow/python/feature_column/feature_column.py +++ b/tensorflow/python/feature_column/feature_column.py @@ -2158,7 +2158,7 @@ def _create_categorical_column_weighted_sum(column, initializer=init_ops.zeros_initializer(), trainable=trainable, collections=weight_collections) - return _safe_embedding_lookup_sparse( + return embedding_ops.safe_embedding_lookup_sparse( weight, id_tensor, sparse_weights=weight_tensor, @@ -2594,7 +2594,7 @@ class _EmbeddingColumn( }) # Return embedding lookup result. - return _safe_embedding_lookup_sparse( + return embedding_ops.safe_embedding_lookup_sparse( embedding_weights=embedding_weights, sparse_ids=sparse_ids, sparse_weights=sparse_weights, @@ -2736,7 +2736,7 @@ class _SharedEmbeddingColumn( }) # Return embedding lookup result. - return _safe_embedding_lookup_sparse( + return embedding_ops.safe_embedding_lookup_sparse( embedding_weights=embedding_weights, sparse_ids=sparse_ids, sparse_weights=sparse_weights, @@ -3228,161 +3228,6 @@ def _collect_leaf_level_keys(cross): return leaf_level_keys -# TODO(zakaria): Move this to embedding_ops and make it public. -def _safe_embedding_lookup_sparse(embedding_weights, - sparse_ids, - sparse_weights=None, - combiner='mean', - default_id=None, - name=None, - partition_strategy='div', - max_norm=None): - """Lookup embedding results, accounting for invalid IDs and empty features. - - The partitioned embedding in `embedding_weights` must all be the same shape - except for the first dimension. The first dimension is allowed to vary as the - vocabulary size is not necessarily a multiple of `P`. `embedding_weights` - may be a `PartitionedVariable` as returned by using `tf.get_variable()` with a - partitioner. - - Invalid IDs (< 0) are pruned from input IDs and weights, as well as any IDs - with non-positive weight. For an entry with no features, the embedding vector - for `default_id` is returned, or the 0-vector if `default_id` is not supplied. - - The ids and weights may be multi-dimensional. Embeddings are always aggregated - along the last dimension. - - Args: - embedding_weights: A list of `P` float `Tensor`s or values representing - partitioned embedding `Tensor`s. Alternatively, a `PartitionedVariable` - created by partitioning along dimension 0. The total unpartitioned - shape should be `[e_0, e_1, ..., e_m]`, where `e_0` represents the - vocab size and `e_1, ..., e_m` are the embedding dimensions. - sparse_ids: `SparseTensor` of shape `[d_0, d_1, ..., d_n]` containing the - ids. `d_0` is typically batch size. - sparse_weights: `SparseTensor` of same shape as `sparse_ids`, containing - float weights corresponding to `sparse_ids`, or `None` if all weights - are be assumed to be 1.0. - combiner: A string specifying how to combine embedding results for each - entry. Currently "mean", "sqrtn" and "sum" are supported, with "mean" - the default. - default_id: The id to use for an entry with no features. - name: A name for this operation (optional). - partition_strategy: A string specifying the partitioning strategy. - Currently `"div"` and `"mod"` are supported. Default is `"div"`. - max_norm: If not `None`, all embeddings are l2-normalized to max_norm before - combining. - - - Returns: - Dense `Tensor` of shape `[d_0, d_1, ..., d_{n-1}, e_1, ..., e_m]`. - - Raises: - ValueError: if `embedding_weights` is empty. - """ - if embedding_weights is None: - raise ValueError('Missing embedding_weights %s.' % embedding_weights) - if isinstance(embedding_weights, variables.PartitionedVariable): - embedding_weights = list(embedding_weights) # get underlying Variables. - if not isinstance(embedding_weights, list): - embedding_weights = [embedding_weights] - if len(embedding_weights) < 1: - raise ValueError('Missing embedding_weights %s.' % embedding_weights) - - dtype = sparse_weights.dtype if sparse_weights is not None else None - embedding_weights = [ - ops.convert_to_tensor(w, dtype=dtype) for w in embedding_weights - ] - - with ops.name_scope(name, 'embedding_lookup', - embedding_weights + [sparse_ids, - sparse_weights]) as scope: - # Reshape higher-rank sparse ids and weights to linear segment ids. - original_shape = sparse_ids.dense_shape - original_rank_dim = sparse_ids.dense_shape.get_shape()[0] - original_rank = ( - array_ops.size(original_shape) - if original_rank_dim.value is None - else original_rank_dim.value) - sparse_ids = sparse_ops.sparse_reshape(sparse_ids, [ - math_ops.reduce_prod( - array_ops.slice(original_shape, [0], [original_rank - 1])), - array_ops.gather(original_shape, original_rank - 1)]) - if sparse_weights is not None: - sparse_weights = sparse_tensor_lib.SparseTensor( - sparse_ids.indices, - sparse_weights.values, sparse_ids.dense_shape) - - # Prune invalid ids and weights. - sparse_ids, sparse_weights = _prune_invalid_ids(sparse_ids, sparse_weights) - if combiner != 'sum': - sparse_ids, sparse_weights = _prune_invalid_weights( - sparse_ids, sparse_weights) - - # Fill in dummy values for empty features, if necessary. - sparse_ids, is_row_empty = sparse_ops.sparse_fill_empty_rows(sparse_ids, - default_id or - 0) - if sparse_weights is not None: - sparse_weights, _ = sparse_ops.sparse_fill_empty_rows(sparse_weights, 1.0) - - result = embedding_ops.embedding_lookup_sparse( - embedding_weights, - sparse_ids, - sparse_weights, - combiner=combiner, - partition_strategy=partition_strategy, - name=None if default_id is None else scope, - max_norm=max_norm) - - if default_id is None: - # Broadcast is_row_empty to the same shape as embedding_lookup_result, - # for use in Select. - is_row_empty = array_ops.tile( - array_ops.reshape(is_row_empty, [-1, 1]), - array_ops.stack([1, array_ops.shape(result)[1]])) - - result = array_ops.where(is_row_empty, - array_ops.zeros_like(result), - result, - name=scope) - - # Reshape back from linear ids back into higher-dimensional dense result. - final_result = array_ops.reshape( - result, - array_ops.concat([ - array_ops.slice( - math_ops.cast(original_shape, dtypes.int32), [0], - [original_rank - 1]), - array_ops.slice(array_ops.shape(result), [1], [-1]) - ], 0)) - final_result.set_shape(tensor_shape.unknown_shape( - (original_rank_dim - 1).value).concatenate(result.get_shape()[1:])) - return final_result - - -def _prune_invalid_ids(sparse_ids, sparse_weights): - """Prune invalid IDs (< 0) from the input ids and weights.""" - is_id_valid = math_ops.greater_equal(sparse_ids.values, 0) - if sparse_weights is not None: - is_id_valid = math_ops.logical_and( - is_id_valid, - array_ops.ones_like(sparse_weights.values, dtype=dtypes.bool)) - sparse_ids = sparse_ops.sparse_retain(sparse_ids, is_id_valid) - if sparse_weights is not None: - sparse_weights = sparse_ops.sparse_retain(sparse_weights, is_id_valid) - return sparse_ids, sparse_weights - - -def _prune_invalid_weights(sparse_ids, sparse_weights): - """Prune invalid weights (< 0) from the input ids and weights.""" - if sparse_weights is not None: - is_weights_valid = math_ops.greater(sparse_weights.values, 0) - sparse_ids = sparse_ops.sparse_retain(sparse_ids, is_weights_valid) - sparse_weights = sparse_ops.sparse_retain(sparse_weights, is_weights_valid) - return sparse_ids, sparse_weights - - class _IndicatorColumn(_DenseColumn, _SequenceDenseColumn, collections.namedtuple('_IndicatorColumn', ['categorical_column'])): @@ -3419,10 +3264,14 @@ class _IndicatorColumn(_DenseColumn, _SequenceDenseColumn, sp_ids=id_tensor, sp_values=weight_tensor, vocab_size=int(self._variable_shape[-1])) - # Remove (?, -1) index + # Remove (?, -1) index. weighted_column = sparse_ops.sparse_slice(weighted_column, [0, 0], weighted_column.dense_shape) - return sparse_ops.sparse_tensor_to_dense(weighted_column) + # Use scatter_nd to merge duplicated indices if existed, + # instead of sparse_tensor_to_dense. + return array_ops.scatter_nd(weighted_column.indices, + weighted_column.values, + weighted_column.dense_shape) dense_id_tensor = sparse_ops.sparse_tensor_to_dense( id_tensor, default_value=-1) |